GPS Station computes topographic measurement between N points in the ground even at great distances, can also perform measurements between points not visible from each other, for example between a mountain and the other at a very low cost.
GPS Station is an application that allows you to replace equipment that is very expensive to calculate topographic where there is no need for great precision.
The application calculates the distances between points and their angles, and if the phone's GPS provides heights, calculates also azimuth angles, areas and volume of the gradient.